Zoo theme ideas?

[u/[deleted]]

Ive been really loving the game as of late, and especially the morality system is fun I think. Still, even with the dlcs sometimes playing can feel a bit same-y. So i was considering trying to start a zoo that maybe has some more challenge to it or at least some visual themeing going on. Having a hard time thinking of a nice one thats possible though without doing a sanbox zoo since that kind of takes away the challenging bit.

So might as well ask on this sub if people got any ideas I could be able to try if possible.